Paper Abstract and Keywords |
Presentation |
2007-11-19 13:00
Colored Noise Stabilizes Asynchronous Persistent Activity Kosuke Hamaguchi (RIKEN), Nicolas Brunel (CNRS-Univ.) NC2007-67 |
Abstract |
(in Japanese) |
(See Japanese page) |
(in English) |
Prefrontal neurons shows persistent activity during the delay
period of working memory tasks. A natural way to explain the mechanism
of working memory is to assume the transition between attractor
states. The conventional models of attractor network, such as the
Hopfield network, assumes an excitatory reverberation loop,
but the irregular spike patterns before and during the delay
period are difficult to explain solely on the basis of excitatory feedback.
To generate irregular spike patterns, the balance of excitatory and inhibitory inputs is required. An open question here is, how to combine balanced input and bistability. Here we present the conditions for which both the irregular spiking and bistability are found, by using a population of randomly, and sparsely connected Leaky Integrate-and-Fire (LIF) neurons as a simple model of local cortical circuits. For the instantaneous synapse model, our analytical calculation shows that the wide region of the bistable region with high spike irregularity is actually in the oscillatory unstable region. This oscillation destroys the bistable states. However, a realistic synaptic filtering is shown to stabilize the asynchronous state and expand the bistable region, indicating the fundamental role of synaptic filtering on the stability of the working memory. |
Keyword |
(in Japanese) |
(See Japanese page) |
(in English) |
Working Memory / CV / Prefrontal / Oscillation / Inhibition dominated / / / |
Reference Info. |
IEICE Tech. Rep., vol. 107, no. 328, NC2007-67, pp. 71-76, Nov. 2007. |
Paper # |
NC2007-67 |
Date of Issue |
2007-11-11 (NC) |
ISSN |
Print edition: ISSN 0913-5685 Online edition: ISSN 2432-6380 |
Copyright and reproduction |
All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034) |
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NC2007-67 |
Conference Information |
Committee |
NC |
Conference Date |
2007-11-18 - 2007-11-19 |
Place (in Japanese) |
(See Japanese page) |
Place (in English) |
Saga Univ. |
Topics (in Japanese) |
(See Japanese page) |
Topics (in English) |
neuro-hardware, and general |
Paper Information |
Registration To |
NC |
Conference Code |
2007-11-NC |
Language |
English (Japanese title is available) |
Title (in Japanese) |
(See Japanese page) |
Sub Title (in Japanese) |
(See Japanese page) |
Title (in English) |
Colored Noise Stabilizes Asynchronous Persistent Activity |
Sub Title (in English) |
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Keyword(1) |
Working Memory |
Keyword(2) |
CV |
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Prefrontal |
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Oscillation |
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Inhibition dominated |
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1st Author's Name |
Kosuke Hamaguchi |
1st Author's Affiliation |
RIKEN Brain Science Institute (RIKEN) |
2nd Author's Name |
Nicolas Brunel |
2nd Author's Affiliation |
CNRS Universite-Rene Descartes (CNRS-Univ.) |
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Speaker |
Author-1 |
Date Time |
2007-11-19 13:00:00 |
Presentation Time |
25 minutes |
Registration for |
NC |
Paper # |
NC2007-67 |
Volume (vol) |
vol.107 |
Number (no) |
no.328 |
Page |
pp.71-76 |
#Pages |
6 |
Date of Issue |
2007-11-11 (NC) |
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